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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f30aa23f3bd28e4fd3c98ae42538c036f02af67cfcc120e7972da5192a0af9d' 
  AND token = 'd8O8kyKYCBUct0nyCev762rSO+gSGHPHDU0MsD1k7CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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