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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a0898b46937f991f2c8e2052a0878d8c2e31ab5ff8743acf40fa97e2f6270a' 
  AND token = 'qBoiCGm/HuPJ4v76qJ2dl2NuMWPTa4ERXgKRF4tO3VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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