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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa120678d7f1ba91e8e24f6a65cb6d3070b392f8dfad12906aedbdf385b836a' 
  AND token = 'ss3xnWDbwBb5UgAumIRdc+P7H/dl+2y7z0LOWizEjt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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