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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c370a3f6dd9bb0e014e0103f4fc86d11ddcb9106fe153330c89a4c546f5c8f52' 
  AND token = '5IP0n4/zqm4AKPva+81hAAYxqLlec3bogKBvv+28t+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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