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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9c096591772333806e0d94086155ba7e40e102cf56ffaeb4afdbb903d0c92da' 
  AND token = 'jB7XrzwRV3kIyhUJd3jTGXc5ThB2I8eLh5/rXL8k1/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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