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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2db54c4c2ea27384f46fcb223e5097410feb86d13552b0029e7cc4fce685859' 
  AND token = 'BOjRc/YZrzVc/uLHCq9qfSmtzp3C0gMEfB1MMOnANxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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