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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '476e4ce306cbde1ac0af8a9c99d71536c9baefb3ba9351e3ac8c5b3a4e060fa9' 
  AND token = 'dfEZb+CxDVuI8eszzRpuZfmN2MXp3DbEFQBFJzAI/DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}