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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53cb115cc0958e9dfeb5f9676fc903caf71f133a707cf1a0bedca238ff714475' 
  AND token = 'KRteL9fMK5WrT27iW8c6Vw1XvJ+1dzJiK48n2u4yl2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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