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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd997a32e63fba0f28eb2f94f3e05fc73db88f2eba9e1abc7c9e25b593ed09185' 
  AND token = 'mKk731szEg2gHHjPN5kcgTYoVNyyiRspV7mEI1t6MGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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