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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b21e23de711b2fc7ed62fbdf5958bb2bae12e7b1dc053be9c7c74c627b743b83' 
  AND token = 'phCMqkT0+Fyq+J2bl7a1r5vBa6ueYows/vHI+2vl+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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