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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e119c9e6012196f69d55a1e8b817fd0137f22d72dd762b5b51943e795c42115d' 
  AND token = 'JbqiQVertjVe4G09TVQ/+FEBI1K6loQn1zIQwRvt6Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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