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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3c4372115575397513ab7f8623e86f7354f06d721976956344ee9164e6c1f5' 
  AND token = 'x+/HT9XRGqmTTaaPYeGmyiV+JMZZZ+NC7W3a/o6tit4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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