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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f901f4f0b10f6e7265d680e8edf47bb2947cc8fcb7a0af6404a5a9ea04bb3b' 
  AND token = 'qbChk/pIlf6gNV3Tm9jAb9Gx4XCQf3iUOOLteS28Zv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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