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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bb1bb16b359492f97f7ec3b42a34b1111971fa7532e54fbe265e7848909b1e' 
  AND token = 'pUYaWybYH8FQgKt4qyE1iMgL9rQt455BISWMWy0izdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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