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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92180d11bf7400cbf99dd096e75d7d8b21a63eafc1e83e6dec88172e65f51c22' 
  AND token = 'iO+IPDp9aBfge4gije7h+0oPkreCm8O4wl+N6UqT3Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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