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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4851a0c70077b7bd58579609945e3c861157e7f12e791911a595a29d4e1f9db9' 
  AND token = 'yX8Q4VO6ArmR/OpZ3mdzG+AHseS4MO/+nbzYgSymVSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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