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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f108930890f331a926a2e8d7f41697920bcfbbaecc897c1debcdb31711176a44' 
  AND token = '9M82iZcSqqj0n0+md3uKkBmnJ/h2qo21Dl3gIJNirAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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