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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8c977115f4e6f732edfc70ac0b292002ed3aafe92ec765f007543c3ff661c09' 
  AND token = 'UzlaQMMcGs8CXeyWC0pXj+8jFobesIvp5dXxKqsOlO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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