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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e575f9df48d9c8e1e60a175e82b28716cf9877fa63c2ceda0b06ae166d5a5561' 
  AND token = '+obUYwnyUWpKmmIXlTE2Gg09xrqLWsnJK3aT+5BcGNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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