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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e14c02aa7a4af4b06d3e8c66fa99ed38a4a3f153a73cfabe8734aeba1bd6d31' 
  AND token = 'pJMb4yQOc3PWFH7na/MgGZtBF5uBATlPAx/Kwv3lZgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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