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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b353c65321f03d4e78eb9408f2fdd1a72f5e6e775ebfc6cfbd53604fc1563c4' 
  AND token = 'fTIaFs3rA3jfv7kf/Uf1tCCHDo4DxLbRA5Xyn4oEw5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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