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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e40cbc6f8d2fd8c8e11e95ede0b4573b5a177759846066d090102d81f2bbe86d' 
  AND token = 'I1QtC2Ne2fzU1O6qv7iG/acCIwZ1E9jQyQd/Q7W/uwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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