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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e6bafa0939109c38649c38b3ccb5b25782f97bd2cf5873d881f1d2f46d29f9' 
  AND token = '3SGDFGnyPFoOHHrk34ZULJoNlPuACpCE7ex2SYuf4wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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