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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2a832d4d3f282f42c78d548d09de1fc6ff01d4359a0b8dd63d1ba00d98ab2e5' 
  AND token = 'OKeCPRwd+3m4dOa8dyidIyinNes6MfuVCKrJ6CBbUuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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