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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f86461f14291313146fb90c181bdb4f140346f2aa8c42d35273105edb2e50c' 
  AND token = 'fGNP9d73uFnKXarwAoVobYjnkQS3YMWfNrRdNsStAew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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