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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f485ed64d6ebc744d188517c89abbaf2dc8d7171092e79c9d886d2214d0aa89' 
  AND token = 'LYp3K5EbwZRZBQuEmg3LdC3czl4wArbvWtN/s1DSELg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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