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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86ae0ad02ac8a5c7b6c9d0b254a4011595a1ac0a38e7b6c496b45af46054385' 
  AND token = 'MvmYyhyNVdraZXZ/cN6loF8bfFqoVbG8YnjsdpnYWt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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