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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '107b69ef5c7dafb9c6fdbfebe7663d7cf2d0998b57194ba2a97f7686e6639d83' 
  AND token = 'U41aul/F0989cc1GepERDQ3P0QC8i9z+hdXdewCG8tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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