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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f12b1f7c0be5ca3b6a6fe37c6fd58ecf6a9aad9d72635c1f3820e36a42600e' 
  AND token = 'WITD1R+Q2RsG6UZ2GU5pY5TZ7h1nqbS1Mmd4PD2YLJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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