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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe768d7bbba2a9d452aab55beaf4597d04ecf0a96bd3f80449d639e348d63578' 
  AND token = 'Y4r+F+iYAC1GQndSW9hhF5GvVVedBH+mGLdx25FheVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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