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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7f02c7417682851ad427ac399383894b3150770ac446e2dd14f8ccdbab936f' 
  AND token = 'ClCAL4WfMpv7FkXRXL9k6Jnbia4B6sw8GBPNoU8k4U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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