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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342cfb02b2adc547b1f51a1a0c8b69f538aa627e45357d5b9f0fa43c2c32aeaa' 
  AND token = '4kSDFt+8eeqW5wKtz8PmWd1GXGYBBQlQH/WzC//8X3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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