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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02cbf49871a4317fb0e0d80b20cb35ff5ebc864be8e4decf407a7b778da0d56e' 
  AND token = 'LkaJX4FY98eSlKMNN93uXDFaMMBgO1iTyxfV/brLVgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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