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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb4297710408c120b593ba46588fb56033affe60bc8c83217608d1382a6beffc' 
  AND token = '7Idz29tHpa3wch84AP8hfP31DJtyqFFPndmFize1+Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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