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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6fd8bd4a2c5a19ef6277eddb08971ec09db9a25daa2f6722762705370496fe' 
  AND token = 'D3WmANGBiKdVI2N5S+p1e2mpMSh2N8oq5ao5XimkalQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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